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        .item>img,
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        .text-muted{font-size: 28px;}
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<body>
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            <a class="navbar-brand" href="#top">现代浏览器博物馆</a>
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        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse navbar-ex1-collapse">
            <ul class="nav navbar-nav">
                <li>
                    <a href="#top">综述</a>
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                <li>
                    <a href="#">简述</a>
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                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">特点
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                        <li>
                            <a href="#Chrome" data-tab="tab-chrome">Chrome</a>
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                            <a href="#Firefox" data-tab="tab-firefox">Firefox</a>
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                            <a href="#Safari" data-tab="tab-safari">Safari</a>
                        </li>
                        <li>
                            <a href="#Opera" data-tab="tab-opera">Opera</a>
                        </li>
                        <li>
                            <a href="#IE" data-tab="tab-ie">IE</a>
                        </li>
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                    <a data-toggle="modal" href='#modal-id'>关于</a>
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            <li data-target="#carousel-id" data-slide-to="1" class=""></li>
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            <li data-target="#carousel-id" data-slide-to="3" class=""></li>
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        </ol>
        <div class="carousel-inner">
            <div class="item active">
                <img data-src="" alt="First slide" src="images/chrome-big.jpg">
                <div class="container">
                    <div class="carousel-caption">
                        <h1>Chrome</h1>
                        <p>Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="http://www.google.cn/intl/zh-CN/chrome/browser/" role="button"
                                target="_blank">点我下载</a>
                        </p>
                    </div>
                </div>
            </div>
            <div class="item">
                <img data-src="" alt="Second slide" src="images/firefox-big.jpg">
                <div class="container">
                    <div class="carousel-caption">
                        <h1>Firefox</h1>
                        <p>Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="http://www.firefox.com.cn/download/" target="_blank" role="button">点我下载</a>
                        </p>
                    </div>
                </div>
            </div>
            <div class="item">
                <img data-src="" alt="Third slide" src="images/safari-big.jpg">
                <div class="container">
                    <div class="carousel-caption">
                        <h1>Safari</h1>
                        <p>Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="http://www.apple.com/cn/safari/" target="_blank" role="button">点我下载</a>
                        </p>
                    </div>
                </div>
            </div>
            <div class="item">
                <img data-src="" alt="Four slide" src="images/opera-big.jpg">
                <div class="container">
                    <div class="carousel-caption">
                        <h1>Opera</h1>
                        <p>Opera浏览器，是一款挪威Opera Software ASA公司制作的支持多页面标签式浏览的网络浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="http://www.opera.com/zh-cn" target="_blank" role="button">点我下载</a>
                        </p>
                    </div>
                </div>
            </div>
            <div class="item">
                <img data-src="" alt="Five slide" src="images/ie-big.jpg">
                <div class="container">
                    <div class="carousel-caption">
                        <h1>IE</h1>
                        <p>Internet Explorer，简称 IE，是微软公司推出的一款网页浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="http://ie.microsoft.com/" target="_blank" role="button">点我下载</a>
                        </p>
                    </div>
                </div>
            </div>
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            <span class="glyphicon glyphicon-chevron-left"></span>
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        <!-- 简介 -->
        <div class="row">
            <div class="col-xs-12 col-sm-4 col-md-4 col-lg-4">
                <center>
                    <img class="img-circle" src="images/chrome-logo-small.jpg" alt="chrome">
                    <h2>Chrome</h2>
                    <p>Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。</p>
                    <p>
                        <a class="btn btn-default" href="http://www.google.cn/intl/zh-CN/chrome/browser/" role="button">点我下载</a>
                    </p>
                </center>
            </div>
            <div class="col-xs-12 col-sm-4 col-md-4 col-lg-4">
                <center>
                    <img class="img-circle" src="images/firefox-logo-small.jpg" alt="firefox">
                    <h2>Firefox</h2>
                    <p>Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器。</p>
                    <p>
                        <a class="btn btn-default" href="http://www.firefox.com.cn/download/" role="button">点我下载</a>
                    </p>
                </center>
            </div>
            <div class="col-xs-12 col-sm-4 col-md-4 col-lg-4">
                <center>
                    <img class="img-circle" src="images/safari-logo-small.jpg" alt="safari">
                    <h2>Safari</h2>
                    <p>Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器。</p>
                    <p>
                        <a class="btn btn-default" href="http://www.apple.com/cn/safari/" role="button">点我下载</a>
                    </p>
                </center>
            </div>
        </div>

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        <!-- 标签页面 -->

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            <!-- Nav tabs -->
            <ul class="nav nav-tabs" role="tablist">
                <li role="presentation" class="active">
                    <a href="#Chrome" aria-controls="tab" role="tab" data-toggle="tab">Chrome</a>
                </li>
                <li role="presentation">
                    <a href="#Firefox" aria-controls="tab" role="tab" data-toggle="tab">Firefox</a>
                </li>
                <li role="presentation">
                    <a href="#Safari" aria-controls="tab" role="tab" data-toggle="tab">Safari</a>
                </li>
                <li role="presentation">
                    <a href="#Opera" aria-controls="tab" role="tab" data-toggle="tab">Opera</a>
                </li>
                <li role="presentation">
                    <a href="#IE" aria-controls="tab" role="tab" data-toggle="tab">IE</a>
                </li>
            </ul>

            <!-- Tab panes -->
            <div class="tab-content">
                <div role="tabpanel" class="tab-pane active" id="Chrome">
                    <div class="tab-pane" id="tab-chrome">
                        <div class="row feature">
                            <div class="col-md-7">
                                 <br>
                                 <br>
                                 <br>
                                 <br>
                                 <br>
                                <h2 class="feature-heading">Google Chrome
                                    <span class="text-muted">使用最广的浏览器</span>
                                </h2>

                                <p class="lead">Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。 该浏览器是基于其他开源软件所撰写，包括WebKit，目标是提升稳定性、速度和安全性，并创造出简单且有效率的使用者界面。
                                </p>
                            </div>
                            <div class="col-md-5">
                                <img class="feature-image img-responsive" src="images/chrome-logo.jpg" alt="Chrome">
                            </div>
                        </div>
                    </div>
                </div>
                <div role="tabpanel" class="tab-pane" id="Firefox">
                    <div class="tab-pane active" id="tab-firefox">
                        <div class="row feature">
                            <div class="col-md-5">
                                <img class="feature-image img-responsive" src="images/firefox-logo.jpg" alt="Firefox">
                            </div>
                            <div class="col-md-7">
                                    <br>
                                    <br>
                                    <br>
                                    <br>
                                    <br>
                                <h2 class="feature-heading">Mozilla Firefox
                                    <span class="text-muted">美丽的狐狸</span>
                                </h2>

                                <p class="lead">Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器， 使用Gecko引擎（非ie内核），支持多种操作系统如Windows、Mac和linux。
                                </p>
                            </div>
                        </div>
                    </div>
                </div>
                <div role="tabpanel" class="tab-pane" id="Safari">
                    <div class="tab-pane" id="tab-safari">
                        <div class="row feature">
                            <div class="col-md-7">
                                    <br>
                                    <br>
                                    <br>
                                    <br>
                                    <br>
                                <h2 class="feature-heading">Safari
                                    <span class="text-muted">Mac用户首选</span>
                                </h2>

                                <p class="lead">Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器，使用了KDE的KHTML作为浏览器的运算核心。 Safari在2003年1月7日首度发行测试版，并成为Mac
                                    OS X v10.3与之后的默认浏览器，也是iPhone与IPAD和iPod touch的指定浏览器。</p>
                            </div>
                            <div class="col-md-5">
                                <img class="feature-image img-responsive" src="images/safari-logo.jpg" alt="Safari">
                            </div>
                        </div>
                    </div>
                </div>
                <div role="tabpanel" class="tab-pane" id="Opera">
                    <div class="tab-pane" id="tab-opera">
                        <div class="row feature">
                            <div class="col-md-5">
                                <img class="feature-image img-responsive" src="images/opera-logo.jpg" alt="Opera">
                            </div>
                            <div class="col-md-7">
                                    <br>
                                    <br>
                                    <br>
                                    <br>
                                    <br>
                                <h2 class="feature-heading">Opera
                                    <span class="text-muted">小众但易用</span>
                                </h2>

                                <p class="lead">Opera浏览器，是一款挪威Opera Software ASA公司制作的支持多页面标签式浏览的网络浏览器。 是跨平台浏览器可以在Windows、Mac和Linux三个操作系统平台上运行。.
                                </p>
                            </div>
                        </div>
                    </div>
                </div>
                <div role="tabpanel" class="tab-pane" id="IE">
                    <div class="tab-pane" id="tab-ie">
                        <div class="row feature">
                            <div class="col-md-7">
                                <br>
                                <br>
                                <br>
                                <br>
                                <br>
                                <h2 class="feature-heading">IE
                                    <span class="text-muted">你懂的</span>
                                </h2>

                                <p class="lead">Internet Explorer，原称Microsoft Internet Explorer(6版本以前)和Windows Internet Explorer(7，8，9，10版本)，
                                    简称IE，是美国微软公司推出的一款网页浏览器。它采用的排版引擎(俗称内核)为Trident。
                                </p>
                            </div>
                            <div class="col-md-5">
                                <img class="feature-image img-responsive" src="images/ie-logo.jpg" alt="IE">
                            </div>
                        </div>
                    </div>
                </div>
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